ch. 13 – light ii. wave properties of light (p. 384 – 388) reflection refraction diffraction...
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Ch. 13 – Light
II. Wave Properties of Light(p. 384 – 388)ReflectionRefractionDiffraction Interference
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A. Reflection
Reflectionwhen a wave
strikes an object and bounces off
incident beam reflected beam
Normal
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A. Reflection
Law of Reflectionthe angle of
incidence equals the angle of reflection
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B. Refraction
Refractionbending of waves when passing
from one medium to anothercaused by a change in speed
• slower (more dense) light bends toward the normal
SLOWER
FASTER
• faster (less dense) light bends away from the normal
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B. Refraction
Refraction depends on…
speed of light in the medium
wavelength of the light – shorter wavelengths (blue)bend more
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B. Refraction
Example:
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C. Diffraction
Diffraction
bending of waves around a barrier
longer wavelengths (red) bend more – opposite of refraction
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D. Interference
Interferenceconstructive brighter lightdestructive dimmer light
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E. Cool Applications!
The “Broken Pencil”refraction
View animation and explanation of the “Broken Pencil.”
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E. Cool Applications!
Rainbowsrefraction-reflection-refraction
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E. Cool Applications!
Diffraction Gratingsglass or plastic made up
of many tiny parallel slitsmay also be reflectivespectroscopes, reflective
rainbow stickers, CD surfaces
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E. Cool Applications!
Thin Films – Bubbles & Oil Slicksinterference results from double reflection
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E. Cool Applications!
Blue Sky & Red Sunsets
NOON• less atmosphere• less scattering• blue sky, yellow sun
SUNSET• more atmosphere• more scattering• orange-red sky & sun
• Molecules in atmosphere scatter light rays
• Shorter wavelengths (blue, violet) are scattered more easily